Circular Polarizer Filter (Lightest Shade)
The Polarizer Filter is perfect for reducing glare, and improving color saturation. When filming from a quadcopter, a large amount of light is reflected back up towards the camera, the Polarizer will reduce the amount of glare bouncing off the ground, leaving behind the most crisp footage possible. The Polarizer can also be used to slow down the cameras shutter speed by 1.6 stops. For night photos this can be especially useful in slowing down the Hero4's shutter speed.
Neutral Density 2-Stop (Mid Shade)
This is probably the most common filter for filming outdoors or from the sky. The 2-stop ND filter reduces the cameras shutter speed by 2-stops which smoothes out quadcopter video, by reducing rolling shutter (commonly referred to as the Jell-O effect). The 2-Stop ND is also used for reducing lens flare while shooting into the sun or toning down highlights while filming outdoors. We usually use the 2-Stop ND filter when it is partly cloudy, and during the early morning or evening hours. This filter can also be used to slow down the shutter speed while shooting in Night Mode on the Hero4 for more balanced exposures.
Neutral Density 3-Stop (Darkest Shade)
The 3-Stop ND filter is designed for filming in very bright conditions. This ND filter will reduce severe Jell-O effect (i.e. rolling shutter), smoothing out high vibration quadcopter footage. We use the 3-Stop ND filter when filming during the middle of a sunny day or to reduct the shutter speed to create motion blur.